fix(#4267): correct tdd.md pointer citations; fix(#4269): collapse plan-level gate-rule duplication (#4295)

* fix(#4267): correct tdd.md pointer citations; fix(#4269): collapse plan-level gate-rule duplication

execute-plan.md and gsd-executor.md each cited "Red-Green-Refactor Cycle"
for three facts (commit-scope contract, fail-fast rule, error handling),
but only the commit-scope contract lives there. Fail-fast is in tdd.md's
"Fail-Fast Rules" subsection (under "Gate Enforcement Rules") and error
handling is in tdd.md's "Error Handling" section — cite each correctly.

gsd-executor.md's "Plan-Level TDD Gate Enforcement" section also fully
restated the gate-sequence rules tdd.md's "Gate Enforcement Rules" already
owns (and covers more thoroughly, including the actual git-log validation
script). Collapse it to a short pointer, matching the treatment already
used by the cycle-steps pointer immediately above it.

Adds tests/tdd-reference-correctness.test.cjs asserting the pointer text
cites the correct section names, that those sections actually carry the
guidance, and that the old gate-sequence restatement is gone from
gsd-executor.md.

Closes #4267
Closes #4269

* docs(#4267): add changeset for tdd.md pointer correctness fix

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

* chore(#4267): acknowledge execute-plan.md growth

execute-plan.md grew 95 bytes (39766 -> 39861) from the corrected
three-section citation in the #3990/#4267 cycle-steps pointer.

Emitted-Drift-Ack-Growth: execute-plan.md — net +95 bytes from citing the "Fail-Fast Rules" and "Error Handling" sections by name instead of a single mis-scoped section (#4267).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

* fix(#4267): update PROSE_ALLOWLIST line numbers shifted by the pointer-citation edit

This branch's edits to agents/gsd-executor.md and gsd-core/workflows/execute-plan.md
shifted line numbers, leaving tests/no-bare-gsd-tools-command-position.test.cjs's
PROSE_ALLOWLIST pointing at stale lines. Update both entries to their new correct
lines (811 and 419 respectively) without changing the underlying prose.

* fix(#4267): restore INVALID_RED citation, fix allowlist line shift after #3770 rebase

The rebase onto next picked up #3770's already-merged fail-fast update to
gsd-executor.md's plan-level gate section, which this branch's own commit
collapses into a pointer. The conflict resolution kept the pointer but
dropped the literal "INVALID_RED" term that tests/tdd-red-evidence.test.cjs
requires gsd-executor.md to name — restored it. Also updates
no-bare-gsd-tools-command-position.test.cjs's PROSE_ALLOWLIST line number
for gsd-executor.md, shifted again by the rebase.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

* test(#4267): fix non-matching regression-guard regex in tdd-reference-correctness

The fail-fast regression guard asserted gsd-executor.md no longer contains
"If a test passes unexpectedly during the RED phase" — but the actual old
prose (removed by this branch's pointer-collapse) read "If a test passes
unexpectedly during RED, STOP". The regex never matched the real old text,
so the assertion would have passed even against the unmodified pre-change
file. Caught by an isolated orthogonal review pass. Fixed to match the
actual removed wording, and confirmed (via a direct grep) it is genuinely
absent from the current file.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

* docs(#4267): backfill changeset PR number

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

---------

Co-authored-by: sim <sim@local>
Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

gsd-core/workflows/execute-plan.md

@@ -292,12 +292,13 @@ End with: **Total deviations:** N auto-fixed (breakdown). **Impact:** assessment
 For `type: tdd` plans — RED-GREEN-REFACTOR:
 
 1. **Infrastructure** (first TDD plan only): detect project, install framework, config, verify empty suite
-2. **Cycle (#3990: stated ONCE):** execute RED → GREEN → REFACTOR exactly as specified in the
-canonical `~/.claude/gsd-core/references/tdd.md` "Red-Green-Refactor Cycle" section — its
-commit-scope contract (`test({phase}-{plan})` → `feat({phase}-{plan})` →
-`refactor({phase}-{plan})`, RED must fail, GREEN must pass, REFACTOR commits only on change),
-its fail-fast rule, and its error handling. The reference is the single source; do not
-improvise a variant.
+2. **Cycle (#3990: stated ONCE; #4267: cited correctly):** execute RED → GREEN → REFACTOR
+exactly as specified in the canonical `~/.claude/gsd-core/references/tdd.md` reference — the
+"Red-Green-Refactor Cycle" section's commit-scope contract (`test({phase}-{plan})` →
+`feat({phase}-{plan})` → `refactor({phase}-{plan})`, RED must fail, GREEN must pass, REFACTOR
+commits only on change), the "Gate Enforcement Rules" section's "Fail-Fast Rules" subsection,
+and the "Error Handling" section. The reference is the single source; do not improvise a
+variant.
 </tdd_plan_execution>
 
 <precommit_failure_handling>